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As far as I know, at least from what I've read here, is that you can use garden soil as long as its devoid of certain fertilizers that may harm fish and that you shouldn't use compost or soil with manure in it as it will eventually release methane gas and destroy the tank ecosystem and kill the fish. Don't quote my on that though.

I recommend mircale grow organic dirt. I'm using it in my current tank and there are lots of articles about using it online. Just make sure to let it soak for a few days before filling the rest of the tank up. It is also important to cap it with gravel you can also use sand if you don't mind mts to get rid of gas pockets.

Multiple tank syndrome. Its when you've been on this forum farrrr too long and see far to many fish you want so you go out and buy an entire pet store's worth of fish tanks. Luckily for me I still only have 2 fish tanks, but i'm slowly starting to catch mts.